This configuration uses Apache mod_proxy_ajp plugin to
load balance JBoss cluster on AJP protocol. This module requires
the service of
mod_proxy
. Thus, in order to get the
ability of handling AJP protocol, mod_proxy and mod_proxy_ajp should
be present in the server.
This module is used to reverse proxy to a backend application
server using the AJP protocol. The usage is similar to an HTTP reverse
proxy, but uses the ajp:// prefix:
Uncomment the following module configurations in
APACHE_HOME/conf/httpd.conf file
LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_balancer_module modules/mod_proxy_balancer.so
LoadModule proxy_ajp_module modules/mod_proxy_ajp.so
Add following configuration to the
APACHE_HOME/conf/httpd.conf
file.
<VirtualHost *:80>
ServerName lb.xyz.com
ServerAlias lb.xyz.com
ProxyRequests Off
ProxyPreserveHost On
<Proxy balancer://cluster>
BalancerMember ajp://abc.com:8009 route=node1
BalancerMember ajp://xyz.com:8009 route=node2
ProxySet lbmethod=byrequests
</Proxy>
ProxyPass / balancer://cluster/ stickysession=JSESSIONID|jsessionid
</VirtualHost>
Usually, no ProxyPassReverse directive is necessary. The AJP
request includes the original host header given to the proxy, and
the application server can be expected to generate self-referential
headers relative to this host, so no rewriting is required.
Server-Side Configuration
:
-
For each node in the cluster, open the server.xml
file located at
[appserver root]/server/<profile_name>/deploy/jbossweb.sar
for editing.
-
Search the server.xml file for the Engine name element and
add a jvmRoute attribute. For example, on a node named node1, edit
the element to read as follows:
<Engine name="jboss.web" defaultHost="localhost" jvmRoute="node1">
-
Save the edited server.xml file.
Note:
For each cluster,
the node value of jvmRoute must be unique and match to the value
of the route of the worker that connects to the respective JBoss
(See BalancerMember Configuration in httpd.conf).
